Ram-Zet

Based on the releases you provided, I can confirm we're talking about the Norwegian avant-garde metal band Ram-Zet.

Formed in Oslo in the late '90s, Ram-Zet is the brainchild of vocalist, guitarist, and keyboardist Zet. The band carved out a unique niche by blending extreme metal with industrial, electronic, and classical violin elements, creating a theatrical and often unsettling sound. A key part of their identity for many years was the dual vocal attack between Zet's harsh screams and the clean, operatic vocals of his wife, Miriam "Sfinx" Renvåg.

Their albums, including those on your list like "Pure Therapy" and "Intra," are known as dense, conceptual works that explore dark psychological themes. While they've maintained a cult following for their fearless experimentation, the band has been relatively quiet on the release front in recent years, with their last studio album, "Intra," coming out in 2009.